wasm: support more vendor libraries

Adds support for:
- box2d
- cgltf
- stb image
- stb rect pack

vendor/box2d/box2d.odin

@@ -3,7 +3,11 @@ package vendor_box2d
 import "base:intrinsics"
 import "core:c"
 
-@(private) VECTOR_EXT :: "avx2" when #config(VENDOR_BOX2D_ENABLE_AVX2, intrinsics.has_target_feature("avx2")) else "sse2"
+when ODIN_ARCH == .wasm32 || ODIN_ARCH == .wasm64p32 {
+	@(private) VECTOR_EXT :: "_simd" when #config(VENDOR_BOX2D_ENABLE_SIMD128, intrinsics.has_target_feature("simd128")) else ""
+} else {
+	@(private) VECTOR_EXT :: "avx2" when #config(VENDOR_BOX2D_ENABLE_AVX2, intrinsics.has_target_feature("avx2")) else "sse2"
+}
 
 when ODIN_OS == .Windows {
 	@(private) LIB_PATH :: "lib/box2d_windows_amd64_" + VECTOR_EXT + ".lib"
@@ -13,6 +17,8 @@ when ODIN_OS == .Windows {
 	@(private) LIB_PATH :: "lib/box2d_darwin_amd64_" + VECTOR_EXT + ".a"
 } else when ODIN_ARCH == .amd64 {
 	@(private) LIB_PATH :: "lib/box2d_other_amd64_" + VECTOR_EXT + ".a"
+} else when ODIN_ARCH == .wasm32 || ODIN_ARCH == .wasm64p32 {
+	@(private) LIB_PATH :: "lib/box2d_wasm" + VECTOR_EXT + ".o"
 } else {
 	@(private) LIB_PATH :: "lib/box2d_other.a"
 }
@@ -21,8 +27,16 @@ when !#exists(LIB_PATH) {
 	#panic("Could not find the compiled box2d libraries at \"" + LIB_PATH + "\", they can be compiled by running the `build.sh` script at `" + ODIN_ROOT + "vendor/box2d/build_box2d.sh\"`")
 }
 
-foreign import lib {
-	LIB_PATH,
+when ODIN_ARCH == .wasm32 || ODIN_ARCH == .wasm64p32 {
+	when VECTOR_EXT == "_simd" {
+		foreign import lib "lib/box2d_wasm_simd.o"
+	} else {
+		foreign import lib "lib/box2d_wasm.o"
+	}
+} else {
+	foreign import lib {
+		LIB_PATH,
+	}
 }
 
 
@@ -1520,4 +1534,4 @@ IsValid :: proc{
 	Joint_IsValid,
 
 	IsValidRay,
-}
+}

vendor/box2d/box2d_wasm.odin

@@ -0,0 +1,4 @@
+//+build wasm32, wasm64p32
+package vendor_box2d
+
+@(require) import _ "vendor:libc"

vendor/box2d/build_box2d.sh

@@ -68,5 +68,7 @@ esac
 
 cd ..
 
+make -f wasm.Makefile
+
 rm -rf v3.0.0.tar.gz
 rm -rf box2d-3.0.0

vendor/box2d/wasm.Makefile

@@ -0,0 +1,32 @@
+# Custom Makefile to build box2d for Odin's WASM targets.
+# I tried to make a cmake toolchain file for this / use cmake but this is far easier.
+# NOTE: We are pretending to be emscripten to box2d so it takes WASM code paths, but we don't actually use emscripten.
+
+# CC = $(shell brew --prefix llvm)/bin/clang
+# LD = $(shell brew --prefix llvm)/bin/wasm-ld
+
+VERSION   = 3.0.0
+SRCS      = $(wildcard box2d-$(VERSION)/src/*.c)
+OBJS_SIMD = $(SRCS:.c=_simd.o)
+OBJS      = $(SRCS:.c=.o)
+SYSROOT   = $(shell odin root)/vendor/libc
+CFLAGS    = -Ibox2d-$(VERSION)/include -Ibox2d-$(VERSION)/Extern/simde --target=wasm32 -D__EMSCRIPTEN__ -DNDEBUG -O3 --sysroot=$(SYSROOT)
+
+all: lib/box2d_wasm.o lib/box2d_wasm_simd.o clean
+
+%.o: %.c
+	$(CC) -c $(CFLAGS) $< -o $@
+
+%_simd.o: %.c
+	$(CC) -c $(CFLAGS) -msimd128 $< -o $@
+
+lib/box2d_wasm.o: $(OBJS)
+	$(LD) -r -o lib/box2d_wasm.o $(OBJS)
+
+lib/box2d_wasm_simd.o: $(OBJS_SIMD)
+	$(LD) -r -o lib/box2d_wasm_simd.o $(OBJS_SIMD)
+
+clean:
+	rm -rf $(OBJS) $(OBJS_SIMD)
+
+.PHONY: clean